| 摘要 |
PURPOSE:To improve wear resistance, strength and bonding strength of a cam shaft, by making the cam lobe of a cam shaft with sintered metals and a sleeve. CONSTITUTION:A cam lobe 3 is made by bonding a first and a second sintered alloys 4, 5 to a sleeve 2. Since coupling of the cam lobe 3 and a stem is achieved by coupling a steel sleeve to the stem also made of steel and they are made of the same material, they can be coupled together securely by way of welding or soldering. Further, since the cam lobe is reinforced by the sleeve and a rather great bonding strength can be obtained also by press fitting and quenching, a cam shaft thus manufactured can be used with no trouble in an engine having a relatively low duty. Thus, it is enabled to manufacture a cam shaft having an excellent wear resistance, strength and bonding strength at a high productivity. |
